Hydrogen uptake by structural steels at cathodic protection in sea water inoculated with sulfate reducing bacteria

Łunarska, E.; Birn, J.; Domżalicki, P.

doi:10.1002/maco.200603980

Cited by 20 publications

(28 citation statements)

References 10 publications

(9 reference statements)

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“…At lower cathodic potentials, SRB were suggested to decrease the near electrode pH of the sea water [8,21], which intensified both, the hydrogen evolution [20] and the promotion effect of H 2 S [9], and thus stimulated the steel hydrogen charging. As shown in [7] and confirmed in the present study (Fig. 8), SRB prevented the formation of cathodic deposits, and hence promoted the hydrogen entry.…”

Section: Discussionsupporting

confidence: 71%

“…The loss of reduction of area and of elongation to fracture has been observed for mild steel slow strain rate tensile tested under overprotective conditions (À 1.0 to À 1.7 V Cu/CuSO4 ) in marine clay containing 30% of water [5]. The decrease in the plasticity has been observed in the case of medium strength steel [6] subjected to cathodic polarization in synthetic sea water.…”

Section: Introductionmentioning

confidence: 78%

“…For example, at the similar cathodic potential corresponding to that used in cathodic protection (À 1060 mV SCE ) the hydrogen charging of quenched and tempered 0.17C-1Cr-1Mo-B-V high strength steel is ten times higher than that of the normalized 0.15C-2Mg-Nb one [2]. Hydrogen charging occurred at cathodic protection in sea water has been shown to be enough to produce hydrogen embrittlement of steels [1, [3][4][5][6]. Substantial decrease in mechanical properties has been observed for prestressed steel in contact with Zn [3].…”

Section: Introductionmentioning

confidence: 99%

“…The presence of sulfate-reducing bacteria (SRB) in the sea water dramatically changes the near surface environment and surface processes and thus affects the hydrogen uptake by different steels subjected to cathodic polarization [7,8]. As a result, the possibility of the hydrogen embrittlement increases.…”

Section: Introductionmentioning

confidence: 99%

“…However, the same biofilm could then stifle the growth of the cracks. Presence of SRB in synthetic sea water substantially decreases the plasticity and fracture energy of the low carbon low alloy sorbite steel [6].…”

Section: Introductionmentioning

confidence: 99%

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Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water

Domżalicki

Łunarska²,

Birn

2007

Materials & Corrosion

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At the slow strain rate tensile tests done using the specially designed facility, the decrease in the elongation to fracture, reduction of area, fracture energy and no effect on the strength have been stated for the low alloy ferrite-pearlite and sorbite steels, polarized in synthetic sea water at potentials corresponding to the cathodic protection (À 800 to À 1400 mV SCE ). Presence of SRB promotes the plasticity loss, being especially pronounced at potentials À 1100 to À 1200 mV SCE . At higher cathodic polarization, the plasticity estimated in inoculated and in sterile water equalizes. The effects have been correlated with the contents of absorbed and of permeable hydrogen. The promotion of hydrogen charging and the plasticity loss by SRB at the low and medium applied cathodic polarization has been accounted for the observed production of S À2 ions and inhibition of deposit formation. The negligible effect of SRB at the high cathodic polarization has been suggested to be a result of the suppression the SRB growth due to the high alkalization of the near surface solution. The same amount of hydrogen produces the less detrimental effect on the sorbite than on the ferrite-pearlite steel. However, at the similar cathodic polarization, the sorbite steel absorbs the highest amount of hydrogen and reveals the most pronounced degradation. Cathodic protection of constructions subjected to the action of SRB in the sea water should provide the conditions, under which no fragment of marine construction could be polarized by potential corresponding to the maximum degradation of the plastic properties of steels (À 1100 to À 1200 mV SCE ).

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water

Domżalicki

Łunarska²,

Birn

2007

Materials & Corrosion

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Biological Fouling and Corrosion Processes

Little¹,

Lee

2022

LaQue's Handbook of Marine Corrosion

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Hydrogen permeation measurements in natural sea environment

Domżalicki

Birn

Łunarska

2008

Materials & Corrosion

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The specially designed, fully equipped, and computerized devices for the underwater long-term measurements have been used to study the hydrogen permeation rate through the structural steels under natural sea water conditions. By applying constant cathodic potentials, the polarization current and the hydrogen permeation rate were recorded. The temperature and the concentration of S À2 ions in sea water were also measured. After the tests, the concentration of residual hydrogen in samples and the chemistry of the membrane surface were analyzed. The obtained permeation data were compared with the S À2 content in sea water and with the chemistry and appearance of formed deposits. The effect of SRB on the hydrogen permeation through structural steels is dependent on the site of the sample placing and on the sea water temperature. At a lower water temperature, the low hydrogen absorption was measured due to a lower activity of SRB. The highest hydrogen uptake accompanied by the highest content of S in corrosion and cathodic deposits was observed for membranes situated on the sea bed. The electric field of cathodically protected wall did not affect the hydrogen absorption. The hydrogen uptake recorded under the natural sea conditions can be higher than that measured in the laboratory tests, which should be taken into account while servicing marine constructions, especially embedded ones.

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Hydrogen uptake by structural steels at cathodic protection in sea water inoculated with sulfate reducing bacteria

Cited by 20 publications

References 10 publications

Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water

Effect of cathodic polarization and sulfate reducing bacteria on mechanical properties of different steels in synthetic sea water

Biological Fouling and Corrosion Processes

Hydrogen permeation measurements in natural sea environment

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